Toni Van Remortel wrote:
>>> How can I reduce bandwidth usage for full backups?
>>>
>>> Even when using rsync, BackupPC does transfer all data on a full backup,
>>> and not only the modified files since the last incremental or full.
>> That's not true. Only modifications are transfered over the network
>> when using rsync. Full backups are just more thoroughly checking
>> whether files have changed (not just comparing timestamps, but
>> actually checking the contents of the files).
> Then I wonder what gets transferred. If I monitor a full dump, the
> bandwidth usage is way much higher than when I copy it manually. If a
> simple 'rsync -auv' takes 2 hours to complete against a backup from 1
> day ago, they why does BackupPC take 2 days for the same action?
On fulls, backuppc adds --ignore-times to the rsync arguments. Try a
comparison against that for the bandwidth check. This makes both ends
read the entire contents of the filesystem so the time will increase
correspondingly. The backuppc side is also uncompressing the stored
copy and doing the checksum exchange in perl code which will slow it
down a bit. You can speed this up some with the checksum-seed option.
If you don't care about this extra data check, you could probably edit
Rsync.pm and remove that setting.
--
Les Mikesell
[EMAIL PROTECTED]
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